초록

In the digital world, the digital media is currentlyevolving at such a rapid pace, intellectual copyright protectionis becoming increasingly important. Now a day, the digitalmedia is available with various image formats, due to whichthey are simple to copy and resell without any loss of quality. Awide range of digital media is often distributed by multiplelevels of distributers in a compressed and encrypted format. Itis sometimes necessary to watermark the compressed encryptedmedia items in the compressed-encrypted domain itself fortamper detection or ownership declaration or copyrightmanagement purposes. The compression pack the informationof raw media into a lower number of bits and an encryptionprocess randomize the compressed bit stream. The encryptionalgorithm used was a stream cipher. While the techniqueembeds watermark in the compressed-encrypted domain, theextraction of watermark can be done in the encrypted anddecrypted domain.